Dont shoot me down but only just found out how to view your system memory when going to activity. When having a few pages Safari pages up and doing general work on two screens I see it is saying USED: 3.94-3.96GB. I only have 4 GB of RAM. Is this maxing out and could I get more out of it for upgrading to 8 or 16GB? Is it a worthy upgrade? If so where is the cheapest place to buy? Dont want to pay Apple prices but want their quality. Also if my Ram is 4GB. Do I have 2x 2GB or 1x 4GB? If I upgrade to 8GB would I just need to get another 4GB if I have a 1x 4GB Ram card?